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Expansion Tanks - How a Diaphragm Expansion Tank Works. When water is heated in a closed system it expands. Water is not compressible, therefore, the additional water volume created has to go someplace. When an expansion tank is installed the excess water enters the pre-pressurized tank (figure 1).
Bladder expansion tanks have a totally replaceable bladder and are often referred to as replaceable diaphragm tanks. This tank must be equipped with large service openings that allow the bladder to be replaced without having to remove the tank from its mounting. Bladder tanks are required in a closed loop heating or chilled water HVAC system to absorb the expanding fluid and limit the pressure within a heating or cooling system.